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| Residual structural and compression model of undistributed marine sediment |
| LI Haichao1, ZHANG Yuhui1, HE Zuoyue2, LI Xinyu1, LI Tao1 |
| (1. Transportation Science and Engineering College, Civil Aviation University of China, Tianjin 300300, China；2. Guangdong Communication Planning and Design Institute Group Co., Ltd., Guangzhou, Guangdong 510507, China) |
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Abstract The paper presents a novel structured compression model for marine sediments based on the concept of residual structure, which accounts for non-linear deformation behavior. The proposed model features a straightforward formula that includes a few parameters with clear physical meanings. The model’s performance is validated by fitting it to the oedometer test data of Gravina calcarenite. Subsequently, we conducted a series of one-dimensional numerical compression tests using the discrete element method to investigate the impact of residual structure on the compressive behavior of marine sediment samples. Post-testing, some cementation bonds remain intact, corresponding to the residual structure. Additionally, we analyzed how model parameters influence the evolution of structural degradation. The model’s predictions were compared with compression test data from various types of structured soils, including in-situ sedimentary soils, cemented soils, hydrate-bearing soils and urban soils from Mexico. The results demonstrate a strong correlation and offer new theoretical insights into the structural degradation of soils. Notably, the compressibility of structured soil samples increases rapidly with increasing load, with the compression curve approaching that of remolded samples. This characteristic may be influenced by the residual structure, and the proposed model effectively captures this behavior. The current study contributes to the planning, design, and construction of offshore artificial islands and airports by enabling accurate calculations of foundation settlement. However, a primary limitation of the proposed model is its inability to account for the effects of shear deformation on structural degradation, which necessitates further refinement.
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2025, Vol. 44 
